We manipulated transformational and transactional leadership styles and compared them in individual and group task conditions to determine whether they had different impacts on individualists and collectivists performing a brainstorming task. Results showed that collectivists with a transformational leader generated more ideas, but individualists generated more ideas with a transactional leader. Group performance was generally higher than that of individuals working alone. However, contrary to expectations, collectivists generated more ideas that required fundamental organizational changes when working alone.